NFS: Fix a compile issue when !CONFIG_NFS_V4_1

The attempt to display the implementation ID needs to be conditional on
whether or not CONFIG_NFS_V4_1 is defined

Reported-by: Bryan Schumaker <Bryan.Schumaker@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

fs/nfs/super.c

@@ -775,7 +775,6 @@ static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
 #endif
 #endif
 
-#ifdef CONFIG_NFS_V4
 #ifdef CONFIG_NFS_V4_1
 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
 {
@@ -785,9 +784,26 @@ static void show_pnfs(struct seq_file *m, struct nfs_server *server)
 	else
 		seq_printf(m, "not configured");
 }
+
+static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
+{
+	if (nfss->nfs_client && nfss->nfs_client->impl_id) {
+		struct nfs41_impl_id *impl_id = nfss->nfs_client->impl_id;
+		seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
+			   "date='%llu,%u'",
+			   impl_id->name, impl_id->domain,
+			   impl_id->date.seconds, impl_id->date.nseconds);
+	}
+}
 #else
-static void show_pnfs(struct seq_file *m, struct nfs_server *server) {}
+#ifdef CONFIG_NFS_V4
+static void show_pnfs(struct seq_file *m, struct nfs_server *server)
+{
+}
 #endif
+static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
+{
+}
 #endif
 
 static int nfs_show_devname(struct seq_file *m, struct dentry *root)
@@ -836,13 +852,7 @@ static int nfs_show_stats(struct seq_file *m, struct dentry *root)
 
 	seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
 
-	if (nfss->nfs_client && nfss->nfs_client->impl_id) {
-		struct nfs41_impl_id *impl_id = nfss->nfs_client->impl_id;
-		seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
-			   "date='%llu,%u'",
-			   impl_id->name, impl_id->domain,
-			   impl_id->date.seconds, impl_id->date.nseconds);
-	}
+	show_implementation_id(m, nfss);
 
 	seq_printf(m, "\n\tcaps:\t");
 	seq_printf(m, "caps=0x%x", nfss->caps);